Network Switch Monitoring: How to Monitor Switch Performance with SNMP

Andrii Kernitskyi Last updated on Aug 14, 2025

Table of Contents

If you’ve spent any time managing networks, you know the switch is the backbone that keeps everything connected, but it’s easy to take them for granted until something breaks. Monitoring network switches isn’t just “nice to have”; it’s critical if you want to avoid those sudden outages that bring everything to a halt.

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What Is Network Switch Monitoring?

Let’s start with the basics: A network switch is a device that connects multiple devices in a local network (think computers, printers, servers) and makes sure data gets to the right place quickly and efficiently. Unlike a hub, which blasts data everywhere, a switch is smarter: it sends data only where it’s supposed to go, reducing unnecessary traffic and keeping things running smoothly.

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Why Should Your Business Monitor Your Network Switches?

You might think, “The switches are working fine, why bother monitoring them all the time?”

Once you’ve had a switch failure cause downtime or a traffic jam choke your network, you’ll see why monitoring is non-negotiable.

  • Optimize the Performance of Switches: Switches handle tons of traffic daily. Monitoring helps you ensure data flows smoothly, avoiding bottlenecks and congestion that slow down users and applications.
  • Proactively Troubleshoot Switch Issues: Instead of scrambling after a switch fails or a port goes down, monitoring lets you spot warning signs early (like rising error rates or CPU spikes) and fix problems before they hit production.
  • Plan for an Increase in Network Switch Capacity Requirements: Network demands grow. By watching bandwidth and resource usage trends, you can plan hardware upgrades or bandwidth increases before you max out your switches.
  • Security Monitoring Via Network Switches: Switches can reveal suspicious activity and unexpected traffic spikes. Monitoring helps catch these security red flags early.

In short, monitoring your switches isn’t just about uptime. It’s about running a network that’s efficient, secure, and ready to scale without surprises.

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What Is SNMP For Network Switch Monitoring?

SNMP has been around since the late ‘80s and hasn’t lost its relevance because it’s simple, lightweight, and widely supported. Here’s how it works: switches have MIBs (Management Information Bases), which are like databases of status and stats.

Your monitoring tool polls the switch at regular intervals, asking for these OIDs, or the switch can send “traps,” which are alerts triggered by specific events like a port going down. This way, you get real-time or near-real-time visibility into switch health and performance.

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How to Monitor Network Switches with SNMP & NPM

Reliable switch monitoring doesn’t have to be complicated — but if you set it up properly from day one, you’ll save yourself countless hours.

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Step 1: Deploy Your Network Switch Monitoring Tool

Before you can monitor anything, you need the right tool in place.

  • Start with a Free Trial: Most tools, including Obkio, offer free trials. Set it up in your environment and see if it fits your needs. Testing early saves headaches down the road.

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Step 2: Enable SNMP on Your Network Switches

Your network switch monitoring software needs SNMP data from the switch to track performance.

  • Enable SNMP: Log in to your switch via CLI or web UI and enable the SNMP service.
  • Configure SNMP Credentials: Set a community string for SNMP v1/v2c or configure user credentials for SNMP v3.
  • Allow SNMP Through Firewalls: Ensure SNMP traffic is allowed between your monitoring servers and switches.

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Step 3: Add Network Switches to Your Monitoring Tool

Add Switch as SNMP Device: In your monitoring tool’s dashboard, add each switch by its IP address and provide SNMP credentials.

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Key Network Switch Performance Metrics

1. Bandwidth Utilization: The amount of data passing through each switch port over time.

  • 2. CPU & Memory Usage: The processing and memory load on your switch’s hardware.
  • 3. Interface Status & Errors: The operational state and quality of each port.
  • 4. Latency & Packet Loss: The delay in packet delivery and percentage of packets that never reach their destination.
  • 5. Device Availability & Uptime: The ability of the switch and its ports to remain operational.

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Conclusion: How to Keep Your Network Switches Healthy

Monitoring switch availability, ports, traffic patterns, and hardware health gives you the visibility you need to catch issues before they impact users or business operations.